A squirrel would be easy to place on a shoulder, and keep track of, but squirrels can't pick locks.

"I rescind what I said about security." That chair was far more effective than a group of guards in Camelot. Although, that's not really a fair comparison, as scarecrows are likely better guards than those in Camelot.

Getting a door, or two between the women and a handsy chair, Morgana has a long corridor, and two directions to decide between.